TITLE:   GCN CIRCULAR
NUMBER:  7820
SUBJECT: Swift/UVOT observations of GRB080604 
DATE:    08/06/04 21:27:12 GMT
FROM:    Massimiliano de Pasquale at MSSL-UCL  <mdp@mssl.ucl.ac.uk>

  M. De Pasquale (MSSL/UCL), V. La Parola (INAF-IASFPA),
F. E. Marshall (GSFC) report:
The Swift UltraViolet/Optical Telescope (UVOT) began its
first finding chart exposure of GRB080604 (La Parola
et al., GCN circ. 7800) 129 seconds after the trigger
in white filter and detected the optical afterglow (GCN
circ. 7800). The coordinates of this transient are:

  Dec:  15:47:51.68
  RA:  +20:33:28.0

  The afterglow is detected only in the white filter.
Magnitudes and 3 sigma upper limits are listed in the
table below.


  Filter  T_start(s)  T_stop(s)  Exp(s)     Magnitude

  white     129         228       99     20.1 +/- 0.2

  white     730         739       10        > 19.7

  white     869         968       99     21.0 +0.3 -0.2

  white    1479        1651       39        > 20.7

  white    5369        7031      393     21.8 +0.5 -0.4


   v        235         635      393        > 20.1

   v        769        1373      412        > 20.0

   v       1519        1701       39        > 18.8

   v       5807        7441      393        > 19.9

   v      17489       18395      885        > 20.3


   b       716          725       10        > 19.0

   b      1454         1637       39        > 19.8

   b      5191         6826      393        > 21.0


   u      691           862       39        > 19.4

   u      1430         1612       39        > 19.4

   u      4896         6621      393        > 20.7

   u     12600        13306      689        > 21.0


  uw1     667          1738       46        > 19.6

  uw1    6217         12591     1082        > 21.2


  um2     641        19090      1931        > 21.6


  uw2     745        17482      1395        > 21.4



  The values quoted above are on the UVOT Photometric System
(Poole et al, 2008, MNRAS 383,627). They are not corrected
for the expected Galactic reddening of E(B-V) = 0.049 in the
direction of the burst (Schlegel et al. 1998).

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